Paper-web-control device for reel-fed rotary printing-machines.



H. V. IAIVIESI PAPER WEB CONTROL DEVICE FOR REEL FED ROTARY PRINTING MACHINES.

APPLICATION FILED 1AN.29. I916.

mmmm 23,, mm.

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HENRY VINCENT J'Alll/IES, 0F RADLE'IT, ENGLAND.

PAPER-WEB-CONTRQL DEVICE FOR REEL-FED ROTARY PRINTING-MACHINES.

Specification of Letters Patent.

Patented Apr. 23, 1915.

Application filed January 29, 1916. Serial No. 75,112.

To all whom it may concern:

Be it known that I, HENRY VINCENT JAMES, a citizen of the United Kingdom of Great Britain and Ireland, and resident of Cintra, Aldenham avenue, Radlett, in the county of Herts, England, have invented certain new and useful Improvements in Paper-Web-Control Devices for Reel-Fed Rotary Printing-Machines, of which the following is a specification, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to the feedingof printing presses with paper at a feed tension particularly referring to rotary presses used for the printing of newspapers and sim lar products, in which a number of actual printing portions are frequently employed as one complete unit fed from a number of paper reels, and in which the paper feed tenslon of each web must be maintained practically constant at all printing speeds though at various feed tensions when so employed 1n multiple, according to press requirements.

This paper web feed tension is generally obtained by application of a braketo the paper feed reel, and in my application for United States Letters Patent Serial Number 84757, filed June 17, 1.915, 1 have shown how an automatic electro-dynamic braklng system may be so applied, and in my later application for United States Letters Patent Serial Number 71451, filed Jan. 11, 1916, 1 describe a satisfactory method of obtaining a paper web feed tension for such printing presses by means of a tension device applied directly to the paper web after 1t is unwound from the reel, such device being placed between the paper feed reel and the printing cylinders of the press.

In my said application for United States Letters Patent Serial No. 71451, I describe a mechanical means of gripping the feeding paper web, placed between the paper reel and the printing press cylinders, consistmg as an example of rubber coveredrollers between which thepaper web is passed and frictionally gripped.

The present invention consists in the combination and arrangement of a frictional paper web gripping device and an electrodynamic braking system applied thereto, for the purpose of obtaining a paper web feed tension to the printing cylinders. For the purpose of simplifying the description I will refer to parts similar to those shown ularly to the arrangement shown in Fig. 2

of NO. 34757 and Figs. 1 and 2 of No. 71451.

I will describe the new combination and invention briefly as follows :-the electrodynamic braking element referred to in number 34757 as element No. 1 is suitably mechanically coupled to the paper web gripping device described in No. 71451, for the purpose of retardation and braking of same,the electro-dynamic machine referred to as element No. 2 is suitably mechanically coupled to the main driving gear of the prlnting press, and a means is provided for regulating the energy in the circuits of the armatures.

1 will give the following description as an example of one method of putting my invention into efi'ect and make reference to the accompanying'drawings in which Figure 1 diagrammatically illustrates same, referring to one reel and press only, Fig. 2 is a diagrammatic representation of the connections of the power elements; and Figs. 3 and 4 illustrate roller gripping devices similar to those illustrated in my cited application No. 71451. For the gripping device I employ two rollers T and T each having parallel rubber faces over a part of their length fully equal to the maximum width of the paper web and shafts P and P extended at both ends, and mount them at a convenient position on the press between the paper reel a and the printing cylinders of the printing press by carrying their shafts in ball bearings B, the bearings of the roller T being fixed and those of the roller T carried in a bearing block B slidable on guides G allowing of position adiustment, but all carried in the press frame sides, and in such a manner that the rubber faces of the rollers will be normally parallel tothe faces of the printing cylinders.

Attached to each bearing of Roller T, 1

mount an adjustable tension sprin Z by held clear of roller T for the purpose of readily threading the paper web between the rollers during the processes of sheeting up and general make ready of the press.

As shown in Fig. 1 at a conveniently near point to the rollers I mount an electrodynamic machine M which I will refer to as power element No. land mechanically couple its armature shaft n to the extended shaft p of the rollerT in a manner and through gear 9 of such a ratio that at maximum press speed with full field magnet excitation it will develop a pre-determined maximum electro-motive force across its armature say 200 volts. I mount a second electro-dynamic machine M which I will refer to as power element No. 2 at any convenient position and mechanically couple its armature shaft N to any convenient shaft of the actual printing press in such a manner and through gear 9 of such a ratio that at maximum press speed with full field magnet excitation it w1ll develop an electromotive force equal to that of the' No. 1 power element at maximum press speed, say also 200 volts.

I electrically connect the field magnet circuits F and F of power elements M and M respectively, to the supply mains S and'obtain normal excitation.

I electrically connect the armatures N and N of the No. 1 and No. 2 power'elements respectively and a suitable variable ohmic resistance 1' all three in series across the supply mains, the two armatures in such a mannerthat when the N0. 1 power element coupled to the roller T is driven thereby, it will develop an electro-motive force tending to boost up the voltage of the supply mains, and the No. 2 power element, in such a manner that in operation as described, it will tend to set up an electromotive force in opposition to the supply mains. I y

The two electric power elements M and M are in no manner directly associated with the driving of the printing press and their action relative to the main driving source'is as follows: With the press at rest and a source of energy from the supply mains S feeding the electric power elements M and M they both tend to become simple power driving elements, elements M tending to turn the roller T in a direction of rotation which will tighten the web between the printing cylinders and roller T and the element M tending to turn the printing cylinder to which it is coupled by. gear 9 in the direction of its normal rotation in the process of printing, that is, it will tend thereby to drive the printing press. In this manner the correct feed web tension is maintained by element M with the press at rest, and the tendency of element M to move the press is a negligible quantity.

Whenthe press is driven by the main power the conditions in element M and M cl1ange-element M is driven by roller T and is so electrically connected as to its field and armature that it becomes a generator, and generates an electromotive-force of like directions as that of the supply mains S- and so boosts up the voltage of the latter,-' and element M is so electrically connected as to its field and armature that it operates as an electric motor and assists in driving the press, and sets up an electro-motive force of opposite directions to that of the supply mains Sand elements M and M are so geared to the press through gears g and g that their speeds at all times correspond with oneanother. The electro-motive force in each armature is likewise at all times and speeds equal, but of opposite directions, the one therebly equalizing and at all times neutralizing t e other, with a re sult that the voltage of the supply mains S is at all times and speeds the effective electro-motive force through the circuit of the armatures of the elements M and M and The field and armature windings of both elements M and M in Fig. 1 are diagrammatic only. The speeds of roller T and the press cylinders at all times correspond to one anotherand the paper feed speed, and likewise to the armatures of elements M and M Under printing conditions, the paper web will be pulled into the printing press by the impression cylinders and likewise the aper web as it passes between the rub- Eer covered rollers will transmit power to roller T at a speed corresponding to the press speed and likewise the roller T will also drive the armature of the No. 1 power element M correspondingly, and further that the armature of the 0. 2 power element will rotate with the press at a corresponding speed, and that No. 1 power element will become a generator and develop a like direction of electro-motive force as that of the supply mains, and that the No. 2 power element armature will develop power energy in the direction of driving the printing press and set up an electro-motive force in opposition to that of the su ply mains, and that as the electro-motive orce developed by both armatures will at all times be of like value of electro-motive force 1,268,4t19 tat the circuit correspond to the ohmic value of the variable resistance, and that a dynamic brake will be developed by the No. 1 power element accordingly, which will be transmitted to the paper web through the rubber covered rollerT and a constant web tension be developed correspondingly at all press speeds. Either electric power element may be used in multiple but it would be necessary to employ one No. 1 power element, reference M, for each independent braking deviceit is only necessary however to employ one No. 2 power element, reference M re gardless of the number of No. 1 power elements.

What I claim and desire to secure by Letters Patent is 1. In an electro-dynamic braking system for a paper web gripping and feed tension device for a reel fed rotary printing press, the combination of an electricity supply circuit inclosing the armature circuits of two electric power elements electrically connected in series, one element mechanically coupled to the paper web gripping and feed tension device and electrically connected to develop a like direction of electro-motive force as that of the supply circuit, and the other power element mechanically coupled to a shaft of the main driving gear of the printing press, and electrically connected to .develop an electro-motive force in opposition to that of the supply mains, and means for varying the energy in the circuit of the armatures of the electric power elements.

2. Braking apparatus for use with paper printing machines between the feed reel and the printing press, said apparatus comprising a paper web gripping device consisting of two parallel rollers one of which is coupled to an electric power element, a second electric power element coupled to the printing press, an electrical connection coupling the armatures of the two electric power ele-' ments in series across the electricity supply mains whereby the said power elements will develop opposing electro-motive forces.

lln Witness whereof I have hereunto set my hand in presence of two witnesses.

HENRY VINCENT JAMES. Witnesses: Lomsn ISABEL Wncsolv,

ERT EDWARD. 

